| 1 | //===- NVPTXSubtarget.cpp - NVPTX Subtarget Information -------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // This file implements the NVPTX specific subclass of TargetSubtarget. |
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| 10 | // |
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| 11 | //===----------------------------------------------------------------------===// |
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| 12 | |
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| 13 | #include "NVPTXSubtarget.h" |
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| 14 | #include "NVPTXTargetMachine.h" |
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| 15 | |
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| 16 | using namespace llvm; |
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| 17 | |
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| 18 | #define DEBUG_TYPE "nvptx-subtarget" |
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| 19 | |
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| 20 | #define GET_SUBTARGETINFO_ENUM |
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| 21 | #define GET_SUBTARGETINFO_TARGET_DESC |
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| 22 | #define GET_SUBTARGETINFO_CTOR |
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| 23 | #include "NVPTXGenSubtargetInfo.inc" |
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| 24 | |
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| 25 | static cl::opt<bool> |
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| 26 | NoF16Math("nvptx-no-f16-math" , cl::Hidden, |
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| 27 | cl::desc("NVPTX Specific: Disable generation of f16 math ops." ), |
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| 28 | cl::init(false)); |
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| 29 | // Pin the vtable to this file. |
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| 30 | void NVPTXSubtarget::anchor() {} |
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| 31 | |
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| 32 | NVPTXSubtarget &NVPTXSubtarget::initializeSubtargetDependencies(StringRef CPU, |
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| 33 | StringRef FS) { |
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| 34 | // Provide the default CPU if we don't have one. |
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| 35 | TargetName = std::string(CPU.empty() ? "sm_30" : CPU); |
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| 36 | |
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| 37 | ParseSubtargetFeatures(CPU: TargetName, /*TuneCPU*/ TargetName, FS); |
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| 38 | |
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| 39 | // Re-map SM version numbers, SmVersion carries the regular SMs which do |
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| 40 | // have relative order, while FullSmVersion allows distinguishing sm_90 from |
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| 41 | // sm_90a, which would *not* be a subset of sm_91. |
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| 42 | SmVersion = getSmVersion(); |
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| 43 | |
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| 44 | // Set default to PTX 6.0 (CUDA 9.0) |
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| 45 | if (PTXVersion == 0) { |
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| 46 | PTXVersion = 60; |
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| 47 | } |
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| 48 | |
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| 49 | return *this; |
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| 50 | } |
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| 51 | |
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| 52 | NVPTXSubtarget::NVPTXSubtarget(const Triple &TT, const std::string &CPU, |
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| 53 | const std::string &FS, |
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| 54 | const NVPTXTargetMachine &TM) |
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| 55 | : NVPTXGenSubtargetInfo(TT, CPU, /*TuneCPU*/ CPU, FS), PTXVersion(0), |
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| 56 | FullSmVersion(200), SmVersion(getSmVersion()), TM(TM), |
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| 57 | TLInfo(TM, initializeSubtargetDependencies(CPU, FS)) {} |
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| 58 | |
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| 59 | bool NVPTXSubtarget::hasImageHandles() const { |
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| 60 | // Enable handles for Kepler+, where CUDA supports indirect surfaces and |
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| 61 | // textures |
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| 62 | if (TM.getDrvInterface() == NVPTX::CUDA) |
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| 63 | return (SmVersion >= 30); |
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| 64 | |
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| 65 | // Disabled, otherwise |
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| 66 | return false; |
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| 67 | } |
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| 68 | |
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| 69 | bool NVPTXSubtarget::allowFP16Math() const { |
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| 70 | return hasFP16Math() && NoF16Math == false; |
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| 71 | } |
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| 72 | |
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